4BYF

Crystal structure of human Myosin 1c in complex with calmodulin in the pre-power stroke state


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.74 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.183 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal Structure of Human Myosin 1C-the Motor in Glut4 Exocytosis: Implications for Ca(2+) Regulation and 14-3-3 Binding.

Munnich, S.Taft, M.H.Manstein, D.J.

(2014) J.Mol.Biol. 426: 2070

  • DOI: 10.1016/j.jmb.2014.03.004

  • PubMed Abstract: 
  • Myosin 1c (Myo1c) plays a key role in supporting motile events that underlie cell migration, vesicle trafficking, insulin-stimulated glucose uptake and hearing. Here, we present the crystal structure of the human Myo1c motor in complex with its light ...

    Myosin 1c (Myo1c) plays a key role in supporting motile events that underlie cell migration, vesicle trafficking, insulin-stimulated glucose uptake and hearing. Here, we present the crystal structure of the human Myo1c motor in complex with its light chain calmodulin. Our structure reveals tight interactions of the motor domain with calmodulin bound to the first IQ motif in the neck region. Several of the calmodulin residues contributing to this interaction are also involved in Ca(2+) binding. Contact residues in the motor domain are linked to the central β-sheet and the HO helix, suggesting a mechanism for communicating changes in Ca(2+) binding in the neck region to the actin and nucleotide binding regions of the motor domain. The structural context and the chemical environment of Myo1c mutations that are involved in sensorineural hearing loss in humans are described and their impact on motor function is discussed. We show that a construct consisting of the motor domain of Myo1c and the first IQ motif is sufficient to establish a tight interaction with 14-3-3β (KD=0.9 μM) and present the model of a double-headed Myo1c-14-3-3 complex. This complex has been implicated in the exocytosis of glucose transporter 4 storage vesicles during insulin-stimulated glucose uptake.


    Organizational Affiliation

    Institute for Biophysical Chemistry, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
UNCONVENTIONAL MYOSIN-IC
A, C
725Homo sapiensMutation(s): 0 
Gene Names: MYO1C
Find proteins for O00159 (Homo sapiens)
Go to Gene View: MYO1C
Go to UniProtKB:  O00159
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
CALMODULIN
B, D
149Homo sapiensMutation(s): 0 
Gene Names: CALM1 (CALM, CAM, CAM1)
Find proteins for P0DP23 (Homo sapiens)
Go to Gene View: CALM1
Go to UniProtKB:  P0DP23
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
AOV
Query on AOV

Download SDF File 
Download CCD File 
A, C
ADP ORTHOVANADATE
C10 H17 N5 O14 P2 V
SWCHWRVRYDCWAN-AZGWGOJFSA-J
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A, C, D
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.74 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.183 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 59.580α = 90.00
b = 158.450β = 91.56
c = 114.340γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHASERphasing
XDSdata scaling
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-03-26
    Type: Initial release
  • Version 1.1: 2014-05-14
    Type: Database references